KYB KG5188 Shock Absorber - Rear

KYB Gas-a-just Rear Shock for GM Vans

The KYB Gas-a-just KG5188 is a rear monotube shock absorber built for Chevrolet Express 1500, Chevrolet Express 3500, GMC Savana 1500, and GMC Savana 3500 applications. It is designed for lowered rear leaf suspension setups and for vans that carry heavier loads, tow, or run larger wheels and tires.

Gas-a-just shocks use a high-pressure monotube layout that separates gas and oil for consistent damping response. The KG5188 adds up to 25% more damping performance over original equipment shocks and is tuned for GM vans that need firmer control without giving up normal-road comfort.

Key Features

• Monotube shock absorber with separate gas and oil chambers
• Up to 25% more damping performance than OE shocks
• High-pressure nitrogen gas for quick response and fade-resistant operation
• Triple chrome plated piston rod helps reduce seal wear
• Designed specifically for GM vans with lowered rear leaf suspension
• Improves steering response and suspension control under load
• Dust cover included

Product Details

KYB Gas-a-just shocks are built to react quickly when suspension demand changes, which makes them a strong choice for rear suspension service on GM full-size vans. The monotube design provides an air-free hydraulic working area for control and a separate gas chamber for consistent pressure, helping the shock maintain performance during repeated compression and rebound cycles. For Chevrolet Express and GMC Savana rear suspension applications, the KG5188 supports stable handling and controlled ride quality in daily driving and work use.

This part cross-references Monroe Shocks & Struts 911085 for the same application.

What It Helps Address

• Excessive rear bounce after bumps or dips
• Reduced control on vans with lowered rear leaf suspension
• Suspension fade during repeated load changes
• Loose steering feel caused by worn rear damping
• Uneven ride control on work vans with heavier tires and wheels

Installation Notes

Fits 2019-2025 Chevrolet Express 3500, rear; 2006-2018 Chevrolet Express 3500, rear; 2003-2014 Chevrolet Express 1500, rear; 2003-2005 Chevrolet Express 3500, rear; 2019-2025 GMC Savana 3500, rear; 2006-2018 GMC Savana 3500, rear; 2003-2014 GMC Savana 1500, rear; 2003-2005 GMC Savana 3500, rear. Confirm rear mounting dimensions and suspension configuration before installation. The listed compressed length is 13.97 in., extended length is 21.61 in., and stroke length is 7.64 in.

Quality Assurance

KYB engineers the Gas-a-just line with monotube construction, high-pressure gas separation, and valving targeted to GM van applications. Part number KG5188 is built to meet the fitment and performance requirements listed for the specified Chevrolet Express and GMC Savana rear suspension applications.